A client diagnosed with diabetes mellitus is admitted to the emergency department (ED) and the cardiac monitor shows multifocal premature ventricular contractions (PVCs). Initial laboratory findings are as follows: The nurse recognizes that the client's PVCs are most likely caused by:

Potassium 2.8 mEq/L

Sodium 133 mEq/L

Chloride 90 mEq/L

Glucose 200 mg/dl

Magnesium 2.5 mg/dL

Calcium 8.0 mg/dL

hypermagnesemia.

hypocalcemia.

hypokalemia.

hyperglycemia.

Answer and Explanation

The Correct Answer is C

A. Hypermagnesemia: Hypermagnesemia (high magnesium levels) can cause bradycardia, hypotension, and prolonged PR and QRS intervals. While it can affect cardiac rhythm, it's less commonly associated with PVCs. The client's magnesium level of 2.5 mg/dL is within the normal range (1.5-2.5 mg/dL).

B. Hypocalcemia: While the calcium level of 8.0 mg/dL is slightly low (normal: ~8.5–10.5 mg/dL), mild hypocalcemia is less commonly associated with PVCs compared to hypokalemia. It can affect cardiac contractility but is not the most likely cause of these arrhythmias.

C. Hypokalemia: The potassium level is 2.8 mEq/L, which is significantly below normal (normal: 3.5–5.0 mEq/L). Potassium is a crucial electrolyte for maintaining normal cardiac electrical activity. Hypokalemia increases myocardial excitability and can lead to various cardiac dysrhythmias and a known cause of ventricular irritability, including multifocal PVCs, and increases the risk of life-threatening arrhythmias in clients with cardiac or metabolic conditions.

D. Hyperglycemia: The glucose level of 200 mg/dL is elevated but not severely high. While it reflects poor glycemic control, it is not directly linked to the occurrence of PVCs. Electrolyte imbalances, particularly low potassium, are more arrhythmogenic.

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Correct Answer is D

Explanation

A. Presence of fine tremors: Fine tremors are not a typical sign of worsening heart failure. They may be associated with medications (like bronchodilators or lithium), metabolic issues, or neurologic disorders, but not directly with heart failure decompensation.

B. Heart rate 50 per minute: Bradycardia may be notable, especially in the context of beta-blocker therapy, but a heart rate of 50 bpm in a stable patient is not necessarily a sign of worsening heart failure unless accompanied by symptoms like dizziness or hypotension.

C. +1 peripheral edema: Mild peripheral edema is often chronic and common in older adults with heart failure. It does not reliably indicate worsening status unless there is a significant increase in edema or associated weight gain and pulmonary symptoms.

D. Increased confusion: Older adults are more susceptible to changes in cognitive function due to decreased cardiac output in worsening heart failure. New or worsening confusion in older adults is a key sign of decreased cerebral perfusion and may signal worsening heart failure. It can also indicate hypoxia or electrolyte imbalance, making it a critical finding that warrants immediate evaluation.

A. Administer the dose later in the day when their nausea subsides B. Assess the client's apical rate C. Contact the physician for STAT serum potassium level D. Administer the client's prescribed dose intravenously

Correct Answer is B

Explanation

A. Administer the dose later in the day when their nausea subsides: Delaying the dose does not address the underlying concern of potential digoxin toxicity. Symptoms like nausea and visual disturbances suggest toxicity and require immediate assessment rather than postponement.

B. Assess the client's apical rate: The first and most appropriate nursing action is to assess the apical heart rate for one full minute, as bradycardia is a key indicator of digoxin toxicity. If the rate is below 60 bpm, the dose should be held, and the provider should be notified.

C. Contact the physician for STAT serum potassium level: Hypokalemia increases the risk of digoxin toxicity, but while checking potassium is important, it is not the first step. Assessment of heart rate is more immediately critical in evaluating the need to hold the medication.

D. Administer the client's prescribed dose intravenously: Administering the dose especially IV when the client has symptoms of toxicity could worsen the situation. Digoxin should be held, not given, until further evaluation and provider notification.

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Potassium 2.8 mEq/L
Sodium 133 mEq/L
Chloride 90 mEq/L
Glucose 200 mg/dl
Magnesium 2.5 mg/dL
Calcium 8.0 mg/dL

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Naxlex Comprehensive Predictor Exams

Which clinical manifestation would the nurse use to indicate that the status of an older adult patient (greater than age 75) with chronic heart failure condition is worsening?

Correct Answer is D

Explanation

The nurse assesses a client who is prescribed digoxin. The client reports nausea and seeing green halos. Which action should the nurse perform?

Correct Answer is B

Explanation

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